Warren Buffett. Alex Wong/Getty Entrepreneurs are never at a loss for unsolicited advice from others who have "been there and done that."

But sometimes, it's hard for new business owners to decipher which nuggets of wisdom are helpful and which will actually do harm.

As a new entrepreneur, you will undoubtedly make wrong turns when you start your own business, but it's better to own your mistakes instead of following bad advice that leads you down the wrong path.

In order to help you determine what to avoid, here is a list of some of the worst advice successful entrepreneurs — such as Warren Buffett and Mark Cuban — have ever received.

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Warren Buffett: "Don't go into the securities business."

Getty Images / Bill Pugliano

For her book, "Tap Dancing to Work: Warren Buffett on Practically Everything, 1966-2011," author Carol Loomis asked Buffett, "What was the best advice you ever received?"

Loomis told ABC News, "I was genuinely surprised when all [Buffett] wanted to talk about was the worst advice."

According to her, Buffett's father and his mentor, Benjamin Graham, told Buffett when he wasn't yet 21 that he shouldn't go into the securities business. Why? Because it was bad timing. Buffett told Loomis, "Maybe their advice was their polite way of saying that before I started selling stocks, I needed to mature a little, or I wasn't going to be successful."

But as we've seen, the investor ignored that piece of advice and went on to become an extremely successful investor with a net worth of $67.4 billion.

Barbara Corcoran: "You can’t do it alone."

BI

An insult from a former boyfriend and business partner ended up being Barbara Corcoran's worst and best piece of business advice. The businesswoman and "Shark" on ABC's "Shark Tank" told Business Insider, "The best advice was the worst advice ... It was from my boyfriend and partner in my first business, The Corcoran-Simone Company, when he told me I would never succeed without him."

She added, "But thank God he insulted me because I would not have built a big business without that insult. It kept me trying everything because I couldn't give him the satisfaction of seeing me fail."

Sometimes, it's hard — or impossible — to find a career that falls in line with your passion. If your passion doesn't help you earn a living, you should find something you're good at, work hard at it and embark on that career path.

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Malcolm Gladwell: "It’s been done."

AP photo/Joe Tabacca

Technically, he's not an entrepreneur, but best-selling author Malcolm Gladwell is regarded as one of the best entrepreneurial writers out there.

When he was just starting out, Gladwell would pass ideas through a friend. He told Business Insider, "When I proposed an idea, she would say, 'It's been done.'" That was the worst advice he'd ever received.

"There are 100 articles written on the same topic every day," said Gladwell. "The world can happily accept more than one approach ... It's all about the execution."

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Danielle LaPorte: "Just do one big thing at a time."

Danielle LaPorte

This best-selling author, motivational speaker, and entrepreneur is brutally honest about some of the terrible business advice she's received over the years. In a blog post, Danielle LaPorte listed some of the worst advice she ever received, including, "Just do one big thing at a time."

She wrote, "When it comes to actually time management I'm a big fan of focus ... But in terms of overall development strategy and creativity, the singular focus route has never worked for me." The more irons she has in the creative fire, "the fire just gets higher."

So work on projects that feed different parts of your brain to keep the fire going.

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Ramit Sethi: "The No. 1 thing you need for a job search is business cards."

Ramit Sethi / I Will Teach You To Be Rich

Personal finance adviser and entrepreneur Ramit Sethi actually has an entire blog post dedicated to some of the worst career advice he's read — this one takes the cake.

Sethi sarcastically explains that whether you are starting your own business or pursuing employment elsewhere, your network and professional skills are your most valuable tools. Things like business cards really won't make or break your chance at success.

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Penelope Trunk: "Do what you love."

Many experts say if you do what you love the money will follow, but entrepreneur Penelope Trunk disagrees. She wrote, "It's preposterous that we need to get paid to do what we love because we do that stuff anyway ... None of us loves just one thing."

If you are looking to make money doing something you love, you might be looking for a long time — or forever. Ignore the pressure to find the perfect career fit and, as Penelope wrote, "Do not what you love; do what you are." A job based off your personal strengths, not just what you love, can make for a rewarding career.